This work presents mineralogical and chemical characteristics of weathering crusts developed on sandstones exposed to various air pollution conditions. The samples have been collected from sandstone tors in the Carpathian Foothill and from buildings in Kraków. It has been stated that these crusts differ in both fabric and composition. The sandstone black crust from tors is rich in organic matte...

Introduction: The secondary minerals of Martian meteorites have long fascinated the scientific community due to their possible formation on Mars, which in turn can provide insight into weathering processes on Mars. Minerals such as jarosite have a restricted set of formation conditions and can provide information as to the pH, Eh, latitude and temperature of fluids on Earth [1-4]. Ca-sulfate (g...

Gypsum is a mineral dust consisting of calcium sulfate and is commonly used in building construction. We here report the first case of an acute calcium sulfate aspiration. An accidental avalanche of fine gypsum powder covered entirely a silo worker. He aspirated a large amount of gypsum powder without loosing consciousness. At admission to the emergency department the patient was breathing spon...

Abstract Energy poverty is a global challenge that demands sustainable and affordable solutions. This study investigates the use of commercial graphene nanofibers (GNFs) as reinforcing agent in gypsum composites for energy-efficient building retrofitting. The GNFs were manually dispersed matrix, fabricated by casting curing. thermomechanical properties systematically studied using various chara...

OBJECTIVE To investigate the variation of the strength of gypsum-bonded dental investments with burnout temperature. METHODS The disc-rupture test was employed at burnout temperatures ranging from 450 to 800 degrees C for four products (Beauty Cast, Cristobalite, Novocast (all WhipMix) and Deguvest California (Degussa)). In this test, an investment disc is created inside an investment mold su...